EP0126036A1 - Inflammable gas detection apparatus with predetermined intervention - Google Patents

Inflammable gas detection apparatus with predetermined intervention Download PDF

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Publication number
EP0126036A1
EP0126036A1 EP84830113A EP84830113A EP0126036A1 EP 0126036 A1 EP0126036 A1 EP 0126036A1 EP 84830113 A EP84830113 A EP 84830113A EP 84830113 A EP84830113 A EP 84830113A EP 0126036 A1 EP0126036 A1 EP 0126036A1
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Prior art keywords
detector
gas
diode
cathode
electrical circuit
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EP84830113A
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German (de)
French (fr)
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EP0126036B1 (en
Inventor
Roberto Ferraro
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CONTROFUGAS Srl
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CONTROFUGAS Srl
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire

Definitions

  • the present invention relates to a flammable gas detector device with predetermined intervention.
  • a flammable gas detector device comprises a detector element in the form of a narrow spiral made of a thin wire of platinum alloy, inserted in a circuit with a resistance bridge by which the variation in resistance of the detector as a function of the density of the gas which surrounds it determines, in the bridge circuit, an imbalance which makes it possible to obtain a control signal from an alarm device and / or d 'intervention.
  • the detector element used has a sensitivity varying according to variations in the operating electric voltage: the value of this voltage being related to the type of gas with which the detector is present. More precisely, it appeared that the supply voltage of maximum sensitivity, and therefore optimal response, of said detector is 2 V DC for methane gas at a concentration of 2% and 1.6 V DC for propano gas. -butane at a concentration of 0.8% and that the variation of the voltage measured at the ends of the detector thus supplied is 0.2 V by passing, in the vicinity of the detector, from the condition of absence of gas to that of presence of gas according to the aforementioned percentage.
  • the main objective of the present invention is to promise a flammable gas detector element of the spiral type made of platinum alloy wire inserted in a circuit with resistance bridges, to operate under conditions of maximum sensitivity.
  • the advantages obtained thanks to the present invention essentially consist in that the device does not provide an optimal response for each type of gas which it is desired to detect; that said minimum value in percentage of gas to be detected is adjustable at will quickly and precisely; that the device is very compact and of minimal weight.
  • the invention will be explained in more detail below, with the aid of a drawing which represents only one possible embodiment.
  • the single figure shows the electrical diagram of an ap such a flammable gas detector with predetermined intervention according to the invention.
  • the operation is as follows. In rest condition, that is to say there is no gas to be detected in the vicinity of the detector (R), care is taken initially, by acting on the potentiometer (P1), to bring the voltage to the ends of the detector (R) at its value, determined experimentally, of maximum sensitivity with respect to the type of gas which it is desired to detect; then we watch, by acting on the potentiometer (P2), to fix the cathode (A) of the diode (DS1) to a potential lower than its threshold potential for a preset quantity in relation to the type and the concentration of gas which one wants to detect so that , by the presence of the diodes (DS2 - DS3), the base of the transistor (TR1) ends up being inversely polarized so that said transistor (TR1) and the transistor (TR2) are cut and that the relay (RL) is not excited.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

The detector element (R) is a spiral of fine Pt alloy wire in a bridge network comprising two fixed resistors (R1,R2) and two variable resistors (P1,P2) one (P1) of which is first set in the absence of gas to give the experimentally optimum voltage across the detector (R). The other variable resistor (P2) is then adjusted to set the cathode of a first diode (DS1) below its threshold voltage for a predetermined concn., with two further diodes (DS2,DS3) holding two transistors (TR1,TR2) cut off so that a relay (RL) is de-energised. Gas concn. above the preset level then provokes a voltage variation for rapid switching of the transistors and relay.

Description

La présente invention concerne un appareil détecteur de gaz inflammable à intervention prédéterminée.The present invention relates to a flammable gas detector device with predetermined intervention.

D'après le brevet européen d'invention N°82830111.9 on sait qu'un appareil détecteur de gaz inflammable comprend un élément détecteur sous forme de spirale étroite faite d'un fin fil en alliage de platine, inséré dans un circuit à pont de résistances par lequel la variation de résistence du détecteur en fonction de la densité du gaz qui l'entoure détermine, dans le circuit à pont, un déséquilibre qui permet d'obtenir un signal de controle d'un disposi tif d'alarme et/ou d'intervention.According to the European invention patent No. 82830111.9, it is known that a flammable gas detector device comprises a detector element in the form of a narrow spiral made of a thin wire of platinum alloy, inserted in a circuit with a resistance bridge by which the variation in resistance of the detector as a function of the density of the gas which surrounds it determines, in the bridge circuit, an imbalance which makes it possible to obtain a control signal from an alarm device and / or d 'intervention.

Des nombreux essais effectués, il est apparu que l'element détecteur utilisé présente une sensibilité variant suivant les variations de la tension électrique de fonctionnement: la valeur de cette tension étant en relation avec le type de gaz avec lequel le détecteur se trouve en présence. Plus pré cisément, il est apparu que la tension d'alimentation de sensibilité maximale, et partant de réponse optimale, dudit détecteur est de 2 V continus pour du gaz méthane en concentration de 2% et de 1,6 V continus pour du gaz propano-butane en concentration de 0,8% et que la variation de la tension mesurée aux extrémités du détecteur ainsi alimenté est de 0,2 V en passant,dans les alentours du détec teur, de la condition d'absence de gaz à celle de présence de gaz selon le pourcentage susmentionné.Numerous tests carried out have shown that the detector element used has a sensitivity varying according to variations in the operating electric voltage: the value of this voltage being related to the type of gas with which the detector is present. More precisely, it appeared that the supply voltage of maximum sensitivity, and therefore optimal response, of said detector is 2 V DC for methane gas at a concentration of 2% and 1.6 V DC for propano gas. -butane at a concentration of 0.8% and that the variation of the voltage measured at the ends of the detector thus supplied is 0.2 V by passing, in the vicinity of the detector, from the condition of absence of gas to that of presence of gas according to the aforementioned percentage.

L'objectif principal de la présente invention est de promettre à un élément détecteur de gaz inflammable de type à spirale en fil d'alliage de platine inséré dans un circuit à pont de résistances, d'opé rer en condition de sensibilité maximale.The main objective of the present invention is to promise a flammable gas detector element of the spiral type made of platinum alloy wire inserted in a circuit with resistance bridges, to operate under conditions of maximum sensitivity.

On est parvenu à cet résultat en conformité à la présente invention en adoptant l'idée consistant à régler d'avance la tension aux extrémités de l'élé ment détecteur, inséré dans un circuit électrique à pont, sur la valeur de sensibilité maximale en relation avec le type de gaz que l'on cherche à détecter et ainsi à utiliser les signaux fournis par ledit circuit en présence de gaz pour porter la cathode d'une diode à sa valeur-seuil et, simultané ment, rendre conductibles deux diodes et exciter un relais de signalisation et/ou de commande.This has been achieved in accordance with the present invention by adopting the idea of regulating in advance the voltage at the ends of the detector element, inserted in an electrical bridge circuit, to the maximum sensitivity value in relation with the type of gas that one seeks to detect and thus to use the signals supplied by said circuit in the presence of gas to bring the cathode of one diode to its threshold value and, simultaneously, make two diodes conductive and excite a signaling and / or control relay.

Les avantages obtenus grace à la présente invention consistent essentiellement en ce que l'appareil don ne une réponse optimale pour chaque type de gaz que l'on veut détecter; que ladite valeur minimale en pourcentage de gaz à détecter est réglable à volonté avec rapideté et précision; que l'appareil est d'encombrement fort réduit et de poids minime.The advantages obtained thanks to the present invention essentially consist in that the device does not provide an optimal response for each type of gas which it is desired to detect; that said minimum value in percentage of gas to be detected is adjustable at will quickly and precisely; that the device is very compact and of minimal weight.

L'invention sera explicitée plus en détail ci-des sous, à l'aide d'un dessin qui représente seulement une forme possible de réalisation. L'unique figure représente le schéma électrique d'un appareil détecteur de gaz inflammable à intervention prédéterminée selon l'invention.The invention will be explained in more detail below, with the aid of a drawing which represents only one possible embodiment. The single figure shows the electrical diagram of an ap such a flammable gas detector with predetermined intervention according to the invention.

Réduit à sa structure essentielle et en se référant au dessin ci-joint, un appareil conforme à l'inven- tion comprend:

  • - un circuit à pont, formé de deux résistances fi xes (R1 - R2) et de deux résistances variables (P1-P2) apte à fournir aux extrémités d'un détecteur(R) de type à spirale en fil d'alliage de platine, insé ré dans une branche dudit circuit, une tension préétablie de sensibilité maximale;
  • - un circuit électronique, composé d'une première diode (DS1), de deux autres diodes (DS2 - DS3) en série, de deux transistors (TR1 - TR2) montés en cascade, de quatre résistances de polarisation (R3-R4- R5- R6), d'un relais (RL) ou d'un dispositif similaire, dont l'excitation permet de mettre en activité un ou plusieurs appareils de signalisation et/ou de controle: toutes ces composantes étant montées selon le circuit de la FIG. 1;
  • - une section en circuit d'alimenation en courant continu, stabilisée par des circuits connus, et sim plement indiquée dans le dissin par (V+).
Reduced to its essential structure and with reference to the drawing attached, an apparatus according to the inven - tion includes:
  • - a bridge circuit, formed of two fixed resistors (R1 - R2) and two variable resistors (P1-P2) capable of supplying the ends of a detector (R) of spiral type made of platinum alloy wire , inserted in a branch of said circuit, a preset voltage of maximum sensitivity;
  • - an electronic circuit, composed of a first diode (DS1), two other diodes (DS2 - DS3) in series, two transistors (TR1 - TR2) connected in cascade, four polarization resistors (R3-R4- R5 - R6), a relay (RL) or a similar device, the excitation of which enables one or more signaling and / or control devices to be activated: all these components being mounted according to the FIG circuit . 1;
  • - a section in the DC power supply circuit, stabilized by known circuits, and simply indicated in the dissin by (V +).

Le fonctionnement est le suivant. En condition de repos, c'est-à-dire d'absence de gaz à déceler dans les alentours du détecteur (R), on prend soin initialement, en agissant sur le potentiomètre (P1),de porter la tension aux extrémités du détecteur (R) à sa valeur, déterminé expérimentalement,de sensibi lité maximale par rapport au type de gaz que l'on veut déceler; ensuite, on veille, en agissant sur le potentiomètre (P2), à fixer la cathode (A) de la diode (DS1) à un potentiel inférieur à son potentiel seuil pour une quantité préétablie en relation avec le type et la concentration de gaz que l'on veut détecter de manière que, par la présence des diodes (DS2 - DS3), la base du transistor (TR1) finisse par etre polarisée inversément de sorte que ledit transistor(TR1) et le transistor(TR2) soient coupés et que le relais (RL) ne soit pas excitè. En présence de gaz dans les alentours du détecteur (R) dans la concentration prévue, se manifeste, aux extrémités du détecteur (R), une variation de tension qui se répercute sur le point (A) du circuit en portant la cathode de la diode (DS1) à sa valeur seuil: en conséquence, le transistor (TR1) commute rapidement en rendant conductible le transistor (TR2) et en provoquant ainsi l'excitation du relais (RL). Cette condition de fonctionnement se maintient pendant tout le temps que le détecteur (R) décèle un pourcentage du gaz prévu supérieur au taux préétabli de sécurité.The operation is as follows. In rest condition, that is to say there is no gas to be detected in the vicinity of the detector (R), care is taken initially, by acting on the potentiometer (P1), to bring the voltage to the ends of the detector (R) at its value, determined experimentally, of maximum sensitivity with respect to the type of gas which it is desired to detect; then we watch, by acting on the potentiometer (P2), to fix the cathode (A) of the diode (DS1) to a potential lower than its threshold potential for a preset quantity in relation to the type and the concentration of gas which one wants to detect so that , by the presence of the diodes (DS2 - DS3), the base of the transistor (TR1) ends up being inversely polarized so that said transistor (TR1) and the transistor (TR2) are cut and that the relay (RL) is not excited. In the presence of gas in the vicinity of the detector (R) in the expected concentration, a variation in voltage is manifested at the ends of the detector (R) which is reflected on the point (A) of the circuit by carrying the cathode of the diode (DS1) at its threshold value: consequently, the transistor (TR1) switches quickly by making the transistor (TR2) conductive and thus causing the excitation of the relay (RL). This operating condition is maintained throughout the time that the detector (R) detects a percentage of the expected gas greater than the preset safety rate.

Exemple de mise en oeuvre.Example of implementation.

Sont indiquées ci-dessous les valeurs des composantes essentielles de l'appareil utilisées en considérant une forme concrète de mise en oeuvre:

Figure imgb0001
The values of the essential components of the device used are given below, considering a concrete form of implementation:
Figure imgb0001

Claims (4)

1) Appareil détecteur de gaz inflammable avec un élément détecteur (R) composé d'une étroite spirale de fin fil en alleage de platine inséré dans un cir cuit à pont de résistances caractérisé par le fait que, pour assurer une réponse optimale du détecteur pour chaque type de gaz dans une concentration pré établie, il comprend, en combinaison: - un circuit électrique à pont de résistances apte à fournir, aux extrémités d'un élément détecteur(R) inséré dans une brance dudit cricuit, une tension prédéterminée de sensibilitè maximale; - un circuit électronique selon le schéma du dessin ci-joint, relié audit circuit électrique à pont de résistances et avec une diode (DS1) dont le poten tiel à la cathode est préétablie de manière inférieure au potentiel seuil selon une valeur correspondant à ladite tension de sensibilité maximale du détecteur (R) et de manière telle que, en l'abs ence de gaz à détecter, les transistors (TR1 - TR2) soient bloqués et que le relais (RL) ne soit pas excité et que les signaux fournis par ledit circuit élecrtique, en présence du gaz détecté, portent la cathode de ladite diode (DS1) à sa valeur seuil, rendent conductibles les transistors (TR1 - TR2) et mettent en excitation le relais (RL). 1) Flammable gas detector device with a detector element (R) composed of a narrow spiral end of platinum lightening wire inserted in a circuit cooked with resistance bridge characterized in that, to ensure an optimal response of the detector for each type of gas in a pre-established concentration, it comprises, in combination: - an electrical circuit with a resistance bridge capable of supplying, at the ends of a detector element (R) inserted into a brance of said cricuit, a predetermined voltage of maximum sensitivity; - an electronic circuit according to the diagram in the attached drawing, connected to said electrical circuit with a resistance bridge and with a diode (DS1) whose potential at the cathode is preset below the threshold potential according to a value corresponding to said voltage maximum sensitivity of the detector (R) and in such a way that, in the absence of gas to be detected, the transistors (TR1 - TR2) are blocked and the relay (RL) is not energized and the signals supplied by said electrical circuit, in the presence of the detected gas, bring the cathode of said diode (DS1) to its threshold value, make the transistors (TR1 - TR2) conductive and energize the relay (RL). 2) Appareil détecteur de gaz inflammable selon la revendication 1) caractérisé par le fait que ledit circuit électrique à pont de résistances comprend une première résistance variable (P1) apte à régler la tension de sensibilité maximale du détecteur (R) en rapport avec le type et la concentration de gaz que l'on veut déceler.2) flammable gas detector apparatus according to claim 1) characterized in that said electrical circuit with resistance bridge comprises a first variable resistance (P1) capable of adjusting the maximum sensitivity voltage of the detector (R) related to the type and concentration of gas you want to detect. 3) Appareil détecteur de gaz inflammable selon la revendication 1) caractérisé par le fait que ledit circuit électrique à pont de résistances comprend une seconde résistance variable (P2) apte à régler le potentiel à la cathode (A) de la diode (DS1).3) flammable gas detector apparatus according to claim 1) characterized in that said electrical circuit with resistance bridge comprises a second variable resistance (P2) capable of adjusting the potential at the cathode (A) of the diode (DS1). 4) Appareil détecteur de gaz inflammable selon la revendication 1) caractérisé par le fait que ledit circuit électronique comprend deux diodes (DS2-DS3) en série, aptes à polariser inversément la base du transistor (TR1) tant que le.potentiel à la cathode (A) de ladite diode (DS1) reste inférieur à la valeur seuil.4) flammable gas detector device according to claim 1) characterized in that said electronic circuit comprises two diodes (DS2-DS3) in series, capable of inversely biasing the base of the transistor (TR1) as long as the potential at the cathode (A) of said diode (DS1) remains below the threshold value.
EP84830113A 1983-05-17 1984-04-12 Inflammable gas detection apparatus with predetermined intervention Expired EP0126036B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84830113T ATE29183T1 (en) 1983-05-17 1984-04-12 COMBUSTIBLE GAS DETECTION DEVICE WITH PREDESIGNED OBJECTOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT09433/83A IT1198606B (en) 1983-05-17 1983-05-17 FLAMMABLE GAS DETECTOR APPARATUS WITH PRECONDITIONED INTERVENTION
IT943383 1983-05-17

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EP0126036A1 true EP0126036A1 (en) 1984-11-21
EP0126036B1 EP0126036B1 (en) 1987-08-26

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EP84830113A Expired EP0126036B1 (en) 1983-05-17 1984-04-12 Inflammable gas detection apparatus with predetermined intervention

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US (1) US4652831A (en)
EP (1) EP0126036B1 (en)
AT (1) ATE29183T1 (en)
DE (1) DE3465645D1 (en)
IT (1) IT1198606B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5218347A (en) * 1991-11-12 1993-06-08 Lindale Industries, Inc. Apparatus for detecting hazardous gases
US5918260A (en) * 1997-06-11 1999-06-29 Cts Corporation Gas sensor with multi-level sensitivity circuitry
EP4027155A4 (en) * 2019-09-04 2023-10-11 Shanghai Roye Electric Co., Ltd. Transformation method for gas density relay, and gas density relay having online self-check function and check method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH579309A5 (en) * 1973-11-09 1976-08-31 Nohmi Bosai Kogyo Co Ltd
DE2714040A1 (en) * 1977-03-30 1978-10-05 Auergesellschaft Gmbh Gas concn. measuring and monitoring device - has two independent measurement bridges, one based on heat conduction and other on heating effect principle

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239828A (en) * 1962-07-27 1966-03-08 Erdco Eng Corp Combustible gas detector
US3399398A (en) * 1965-07-27 1968-08-27 Mine Safety Appliances Co Combustible gas monitoring system
US3577167A (en) * 1968-02-29 1971-05-04 Rca Corp Integrated circuit biasing arrangements
US4384934A (en) * 1978-05-31 1983-05-24 The Flinders University Of South Australia Means for determining the partial pressure of oxygen in an atmosphere
US4352087A (en) * 1981-04-22 1982-09-28 Marie C. Kercheval Fume detector and alarm system
IT1167878B (en) * 1981-05-05 1987-05-20 Franco Maria Conte FLAMMABLE GAS DETECTOR

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH579309A5 (en) * 1973-11-09 1976-08-31 Nohmi Bosai Kogyo Co Ltd
DE2714040A1 (en) * 1977-03-30 1978-10-05 Auergesellschaft Gmbh Gas concn. measuring and monitoring device - has two independent measurement bridges, one based on heat conduction and other on heating effect principle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ELEKTOR, vol. 8, no. 9, septembre 1982, Canterbury, Kent (GB); *
THE RADIO AND ELECTRONIC ENGINEER, vol. 44, no. 2, février 1974, Londres (GB); *

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Publication number Publication date
IT1198606B (en) 1988-12-21
EP0126036B1 (en) 1987-08-26
ATE29183T1 (en) 1987-09-15
IT8309433A0 (en) 1983-05-17
DE3465645D1 (en) 1987-10-01
US4652831A (en) 1987-03-24

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